In vivo BrdU Incorporation Assay for Murine Hematopioetic Stem Cells Ningfei An, Yubin Kang *
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1 In vivo BrdU Incorporation Assay for Murine Hematopioetic Stem Cells Ningfei An, Yubin Kang * Division of Hematology-Oncology, Department of Medicine, Medical University of South Carolina, Charleston, USA *For correspondence: kangy@musc.edu [Abstract] Bromodeoxyuridine (BrdU) is a thymidine analog that is incorporated into DNA during the S-phase of the cell cycle. As such, BrdU incorporation can be used to quantify the number of cells that are in S-phase in the time period during which BrdU is available. The following protocol describes an in vivo BrdU incorporation assay as a measure of cell proliferation in adult murine hematopioetic stem cells (HSCs). Specifically, BrdU incorporation was analyzed for long-term HSCs (LT-HSCs, Lin - Sca-1 + c-kit + CD34 - CD135 - ), Short-term HSCs (ST-HSCs, Lin - Sca-1 + c- Kit + CD34 + CD135 - ) and multipotent progenitors (MPPs, Lin - Sca-1 + c-kit + CD34 + CD135 + ) population. Materials and Reagents 1. Mouse 2. BrdU 3. RPMI Fetal Bovine Serum (FBS) 5. Potassium bicarbonate 6. Ammonium chloride 7. EDTA 8. BSA 9. Lineage Cell Depletion Kit (including Biotin-Antibody Cocktail and Anti-Biotin MicroBeads) (Miltenyi Biotec, catalog number: ) 10. BD Cytofix/Cytoperm Buffer (Becton, Dickinson and Company, catalog number: ) 11. BD Perm/Wash Buffer 12. DNase (included in FITC BrdU Flow Kit) (Becton, Dickinson and Company, catalog number: ) 13. DPBS without calcium, magnesium (diluted from 10x DPBS) (Hyclone, catalog number: SH ) 14. Antibodies: PE-conjugated-Sca-I (Becton, Dickinson and Company, catalog number: ) APC-conjugated-c-Kit (Becton, Dickinson and Company, catalog number: ) Copyright 2013 The Authors; exclusive licensee Bio-protocol LLC. 1
2 PerCP-eFluor 710-conjugated-CD135 (ebioscience, catalog number: ) efluor 450-conjugated CD34 (ebioscience, catalog number: ) BrdU-FITC (included in FITC BrdU Flow Kit) (Becton, Dickinson and Company, catalog number: ) 15. Buffer A (see Recipes) 16. Red blood cell lysis buffer (see Recipes) 17. Staining buffer (see Recipes) Equipment 1. Small scissors and forceps mm tissue culture dish G needle 4. 3 cc syringe ml centrifuge tube 6. Cell strainer (Becton, Dickinson and Company, catalog number: ) 7. Hemacytometer 8. MACS MS column (Miltenyi Biotec, catalog number: ) 9. MiniMASC separator (Miltenyi Biotec, catalog number: ) 10. Centrifuge 11. BD LSRFortessa Analytical Flow Cytometer Procedure 1. Animal injection i.p. Injection of BrdU (10 mg/ml) 100 μl to 8-12 weeks old mouse (50 µg/g BW, so 5 µl/g of BW), after 6 h, inject the second dose. 2 h post 2 nd injection, euthanize the mice using CO2 method followed by cervical dislocation, obtain the bone marrow (BM) cells from 2 tibias and 2 femurs. Two injections ensure that BrdU can incorporate to DNA of both slow and quick turnover cells. 2. Obtain total bone marrow (BM) cells a. Use small scissors and forceps, dissect out femurs and tibias from mice and place them in a 60 mm tissue culture dish containing 6 ml ice-cold RPMI1640 with 5% heat inactivated FBS. Use Kimwipe tissue to remove muscle and other tissues. Cut off both ends of each bone shaft in the dish. b. Connect the end of the bone with 23 G needle on 3 cc syringe, flush out bone marrow with RPMI1640 with 5% heat inactivated FBS into the dish. Disaggregate Copyright 2013 The Authors; exclusive licensee Bio-protocol LLC. 2
3 bone marrow tissues by repeated aspirations using the same needle. Transfer the cell suspension to 15 ml centrifuge tube. c. Spin down the cells at 350 x g for 5 min at room temperature, remove the supernatant, resuspend the cells in 1 ml of room temperature red blood cell lysis buffer and incubate at room temperature for 5 min, then add 5-10 ml of RPMI 1640 with 5% heat inactivated FBS. d. Pass the cells through a cell strainer. Collect the flow through to a new tube. Take an aliquot and count the cells in a hemacytometer. Spin down at 350 x g for 5 min at room temperature. Remove the supernatant; the cell pellet should not contain any red color. Disaggregate the cell pellet and wash the cells one time with buffer A, spin down at 350 x g for 5 min at room temperature. 3. Lineage cell staining (follow the mouse Lineage Cell Depletion Kit) a. Resuspend the total BM cells in buffer A (40 μl/10 7 cells). b. Add Biotin-Antibody Cocktail (10 μl/10 7 cells) to stain the lineage differentiated cells. Cocktail of biotin-conjugated monoclonal antibodies contains anti-cd5, anti-cd45r (B220), anti-cd11b, anti-gr-1(ly-6g/c), anti-neutrophil (7/4) and anti-ter-119. c. Mix well and incubate for 10 min at 4 C. d. Add additional buffer A in media (30 μl/10 7 cells) then add Anti-Biotin MicroBeads (20 μl/10 7 cells, provided in Lineage Cell Depletion Kit). e. Mix well and incubate for 15 min at 4 C. f. Wash cell by adding 2 ml of buffer A. Centrifuge at 300 x g for 10 min at room temperature. g. Remove the supernatant and resuspend the pellet in 0.5 ml of buffer A. 4. Lineage depletion a. Place MACS MS column in MiniMASC separator. b. Prepare column by rinsing with 0.5 ml buffer A. c. Apply cell suspension onto the column. Allow the cells to pass through and collect flow through as Lin - fraction. d. Wash column 3 times with buffer A (0.5 ml/each), wash each time once the column reservoir is empty. e. Collect all the elute (Lin - ) in one tube. f. Count the Lin - cells, aliquot 1.5 x 10 6 cells to a new tube. g. Add 2 times more staining buffer to the cell suspension. h. Centrifuge the cells at 350 x g for 5 min. 5. Stain the Lin- cells with surface antigens: Copyright 2013 The Authors; exclusive licensee Bio-protocol LLC. 3
4 Test Total (μl) Percp-eFluor 710 efluor 450 PE APC Staining buffer CD135 CD34 CD117 Sca-I (c-kit) a. Stain each test sample per 1.5 x 10 6 cells/75 μl buffer, make antibody mix as following, for more samples, increase antibody amount and staining buffer proportionally. b. Add 75 μl of antibody mix to the cell pellet. Incubate cells with antibodies for 15 min at room temperature (protected from light). c. Wash one time with staining buffer. Spin down for 5 min at 350 x g, and discard the supernatant. 6. Fix and permeabilize the cells a. Resuspend the cells in 100 μl of BD Cytofix/Cytoperm Buffer per tube. b. Incubate the cells for 15 to 30 min at room temperature or on ice. c. Wash the cells with 1 ml of 1x BD Perm/Wash Buffer (dilute the 10x buffer with deionized H2O). Centrifuge at 350 x g for 5 min at room temperature, and discard the supernatant. 7. Enhance the permeabilization: a. Resuspend the cells in 100 μl of BD Cytoperm Permeabilization Buffer Plus per tube. This reagent is specially formulated for the BrdU Flow kit and is used as a staining enhancer and secondary permeabilization reagent. b. Incubate the cells for 10 min on ice. c. Wash the cells in 1 ml of 1x BD Perm/Wash Buffer (as in step 5c). 8. Re-fix cells after secondary permeabilization: a. Resuspend the cells in 100 μl of BD Cytofix/Cytoperm Buffer per tube. b. Incubate the cells for 5 min at room temperature or on ice. c. Wash the in 1 ml of 1x BD Perm/Wash Buffer (as in step 5c). 9. Treat with DNase to expose incorporated BrdU a. Resuspend the cells in 100 μl of diluted DNase (diluted to 300 μg/ml in DPBS) per tube, (i.e. 30 μg of DNase/10 6 cells). b. Incubate cells for 1 hour at 37 C. c. Wash the cells in 1 ml of 1x BD Perm/Wash Buffer (as in step 5c). 10. BrdU intracellular antigens staining a. Make diluted BrdU antibody (1 μl to 50 μl/sample in BD Perm/Wash Buffer). b. Incubate the cells for 20 min at room temperature. c. Wash the cells in 1 ml of 1x BD Perm/Wash Buffer (as in step 4c). Copyright 2013 The Authors; exclusive licensee Bio-protocol LLC. 4
5 A B MPP LT-HSC ST-HSC C BrdU-FITC Figure 1. Gating strategy to analyze BrdU incorporation in LT-HSCs. A. BM Lin - cells were labeled with PE-Scal-I and APC-c-Kit antibodies and analyzed by flow cytometry. B. Lin - /Scal- I + /c-kit + (LSK) cells were gated as showed in A and the LSK cells were further analyzed with efluor 450-CD34 and PerCP-eFluor 710-CD135 staining. Long-term HSCs (LT-HSCs, shown as Lin - Sca-1 + c-kit + CD34 - CD135 - ), Short-term HSCs (ST-HSCs, shown as Lin - Sca-1 + c- Kit + CD34 + CD135 - ) and multipotent progenitors (MPPs, shown as Lin - Sca-1 + c- Kit + CD34 + CD135 + ) were separated as indicated. C. BrdU incorporation was further analyzed for each cell population. Data shown are LT-HSCs population analyzed for BrdU staining. 11. Resuspend the cells in 0.3 ml of staining buffer and perform flow cytometry analysis. Samples can be stored overnight at 4 C, protected from light, prior to analysis by flow cytometry. Copyright 2013 The Authors; exclusive licensee Bio-protocol LLC. 5
6 12. Flow cytometry was performed on BD LSRFortessa Analytical Flow Cytometer with the following gating strategy (Figure 1). Recipes 1. Buffer A DPBS, ph 7.2 supplemented with 0.5% BSA and 2 mm EDTA 2. Red blood cell lysis buffer 155 mm potassium bicarbonate 10 mm Ammonium chloride 0.1 mm of EDTA, ph = Staining buffer DPBS, ph 7.2 supplememted with 0.5% BSA and 0.09% sodium azide Acknowledgments This protocol is adapted from An et al. (2013). References 1. An, N., Lin, Y. W., Mahajan, S., Kellner, J. N., Wang, Y., Li, Z., Kraft, A. S. and Kang, Y. (2013). Pim1 serine/threonine kinase regulates the number and functions of murine hematopoietic stem cells. Stem Cells 31(6): Copyright 2013 The Authors; exclusive licensee Bio-protocol LLC. 6
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